This paper evaluates the usage of EasyAccept, a scripted acceptance testing tool, to create from scratch an industry application via acceptance test-driven development (ATDD), a technique that automates software development to some extent. The application was a real-time decision support tool for failures in power system networks, contracted by CHESF, one of Brazil's largest generation and transmission utility. Our experience led us to some interesting insights involving the roles of analysts and programmers in software development.